.dot {
  opacity: 0;
  animation: blink 1.5s infinite;
}
.dot-1 {
  animation-delay: 0s;
}
.dot-2 {
  animation-delay: 0.3s;
}
.dot-3 {
  animation-delay: 0.6s;
}
@keyframes blink {
  0% { opacity: 0; }
  10% { opacity: 1; }
  100% { opacity: 0; }
}
